Nagrarok is the second strongest knightsword, beaten by the The Fallen Angel. It provides 68 Attack, 4 Evade, and 6 Speed, and teaches Nesiaam for 300 AP to the Heritor class. It can only be obtained through the Heritor sidequest.
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A sword from the faraway land of Ivalice. It can inflict status ailments on the enemies it strikes. It features in tales from Ivalice about the end of the world, but in what role, not much is known. It is also said that another knight's sword with a very similar name existed somewhere.
Nagnarok is a Sword that provides 10 ATK, 30% chance of inflicting Confuse and Disease, and 5% Physical Evasion. It is obtained during the Final Fantasy Tactics event, Nelveska Temple.